/**
 * \file
 * \author Norihiro Watanabe
 * \date   2013-04-16
 *
 * \copyright
 * Copyright (c) 2012-2023, OpenGeoSys Community (http://www.opengeosys.org)
 *            Distributed under a Modified BSD License.
 *              See accompanying file LICENSE.txt or
 *              http://www.opengeosys.org/project/license
 */

#include <cstddef>
#include <iosfwd>

#pragma once

namespace MeshLib
{

enum class MeshItemType { Node, Edge, Face, Cell, IntegrationPoint };

/// Char array names for all of MeshItemType values.
static constexpr char const* mesh_item_type_strings[] = {
    "node", "edge", "face", "cell", "integration_point"};

/// Returns a char array for a specific MeshItemType.
static constexpr char const* toString(const MeshItemType t)
{
    return mesh_item_type_strings[static_cast<int>(t)];
}

std::ostream& operator<<(std::ostream& os, MeshItemType const& t);

/// Spatial location description.
///
/// The spatial location is given by a mesh by its \c mesh_id, item's type (face,
/// cell, etc. see MeshItemType), and item's number by its \c item_id.
struct Location
{
    std::size_t          mesh_id;
    MeshItemType         item_type;
    std::size_t          item_id;

    Location(std::size_t meshid, MeshItemType itemtype, std::size_t itemid)
    : mesh_id(meshid), item_type(itemtype), item_id(itemid){}
};

/// Lexicographic order of Location.
inline
bool operator<(const Location& left, const Location& right)
{
    if (left.mesh_id != right.mesh_id)
    {
        return left.mesh_id < right.mesh_id;
    }
    if (left.item_type != right.item_type)
    {
        return left.item_type < right.item_type;
    }
    return left.item_id < right.item_id;
}


std::ostream& operator<<(std::ostream& os, Location const& l);

}   // namespace MeshLib